Apparatus for granulating liquid blast-furnace slag.



B. ERZNHR.

APYLICATION TILED MAR. 28,1914.

Patemed Feb. 16, 1917) APPARATUS FOR GHANULATING LIQUID BLAST FURNACE SLAG.

EDWIN WERZNER, 0F TROISDORF, GERMANY.

APPARATUS FOR GRANULATING LIQUID BLAST-FURNACE SLAG.

Specification of Letters Patent.

Patented Feb. 16, 1915.

Application flle'd March 28, 1914. Serial No. 827,831.

To all whom it may concern:

Be it known that I, EDWIN IVERZNER, a citizen of the German Empire, residing at Troisdorf, in tln. rovince of Rhenish Prussia, Germany, ha e invented certain new and useful Improm nents in Apparatus for Granulatin Liquid Blast-Furnace Slag, of which the ibllowin is a specification.

This invention re ates to a new apparatus for granulating liquid blast furnace slag by treatment with sprayin water and air.

As is known the granu ation of liquid blast furnace slag is effected by chilling or cooling by means of air or water. In the case of air granulation, in addition to a certain quantity of vitreous slag granules, there is a large quantity of devitrified slag granules which must partly be regarded as ballast in cement manufacture; moreover,

the material readily bakes toget'he.. Granulation by means of water necessitates the employment of large quantities of water which are frequently unobtainable or only at great expense; in addition it is neces sary to dry the granulated slag before treating it to form cement.

The present invention has for its object a method of eliminating the defects of water granulation and of obtaining the maximum quantities of vitreous slag gram ules. In order to attain this object, it has already been proposed to conduct the liquid slag to a quickly rotating cell wheel provided with awater supply. Experiments have demonstrated, however, that when this method is employed, the liquid slag does not come into contact with the periphery of the drum, so that it is not broken up mechanically.

In accordance with the invention the method is carried into practice by means of a disintegrator furnished with a water supply and to which the fiery liquid slag is conducted and is there directly cooled partly by the moist eddying air and partly by the spraying water, while the disintegrator breaks it up. Owing to the fact, that the slag is caused to fall through the mist produced by the spraying of the water and thus to come into intimate contact with the particles of water and the air, a good chilling or cooling, and consequently a high percentage of vitreous granules is obtained with a relatively small water consumption.

The apparatus serving to carry the invention into practice is diagrammatically illustrated by way of example in-the accompanying drawings, in which:

Figure 1 is a longitudinal section; Fig. 2 is a side elevation, and Fig. 3 is a plan.

In the example here illustrated a is a disintegrator of known construction with beater bars I), c, and d rotating in'difi'erent directions. The slag is admitted through the channel 0 so that it reaches these bars. Beneath the channel e a water supply pipe f preferably furnished with a nozzle. is arranged. Any desired number of such spraying pipes can be provided. The oper ation of the apparatus is such that the slag entering the disintegrator in a fiery liquid condition falls through the mist produced by the spraying water and is vigorously cooled by intimate contact with particles of water and air, whereupon it is broken up by the bars of the disintegrator .to a uniform granulation. The simultaneous supply of water and air, in addition to effecting a more eflicient cooling of the slag and obtaining a higher percentage of vitreous slag granules, results in the further advantage that the bars of the disintegrator are kept cool and the formation of lumps is entirely prevented, because every piece of slag must pass between the bars and, moreover, the slag is entirely cooled.

Claims 1. In apparatus for granulating liquid blast furnace slag comprising a casing, an inlet chute for the slag, an inlet pipe for the cooling fluid, two independently operating disks within the casing, each of said disks being armed with a concentric row of beater rods, a row upon one disk alternating with the row on the opposite disk, the delivery means for slag and cooling fluid being adapted to deliver within the rows of beaters.

2. In apparatus for granulating liquid blast furnace sla comprising a casing, an inlet chute for t e slag, an inlet pipe for the cooling fluid, said pipe being located beneath the chute, two independently operat- In testimony whereof I have hereunto mg disks within themasmg, one d:=sk can signed my name to t-lns speclficatlon 1n the Zymg two concentric rows of heaLer rods presence of two subscmbmg mtnesses.

and the other a single row intermediate of EDWIN \VERZNER. the two sald rows, and the deln'ery means \Vltnesses: for slag and coohng fluld belng adapted to RUDE. v. STADLER,

deliver within the said rows of heaters. Lows VANDORY. 

